Figure 6.

(a) The abbreviated catalytic cycle, showing comproportionation pathways during activation and oxidative addition. (b) X-band EPR spectrum following the reaction of 2-naphthyl tert-butylcarbonate and 4-methoxyphenylboronic acid catalyzed by ^dcypfNi^II _{(2-ethylPh)(Br)} (left), which is overlaid with the spectrum of the same reaction catalyzed by ^dppfNi^II _(o-tol)(Cl) (right). (c) X-band EPR spectrum following the reaction of 2-bromonaphthalene and 4-methoxyphenylboronic acid catalyzed by ^dcypfNi^II _{(o-tolyl)(Cl)} overlaid with the spectrum of authentic ^dcypfNi^I _Br (left) and the spectrum of the catalytic mixture overlaid with a simulated spectrum (right).